Man pages matching name shm_open in section 3:

shm_open.3.en	debian 10 / manpages-dev
shm_open.3.es	debian 10 / manpages-es
shm_open.3.ja	debian 10 / manpages-ja-dev
shm_open.3.en	debian 11 / manpages-dev
shm_open.3.ja	debian 11 / manpages-ja-dev
shm_open.3.en	debian 12 / manpages-dev
shm_open.3.fr	debian 12 / manpages-fr-dev
shm_open.3.ja	debian 12 / manpages-ja-dev